1832658_wa.c

北大大牛代码 1240道题的原代码 超级权威

# include <stdio.h>

void main()
{
 long i, j, n, sum;
 
 while(1)
 {
  scanf("%ld",&n);

  if(!n) break;
  sum = 0;
  while(1)
  {
   while(n)
  {
   sum += n % 10;
   n /= 10;
  }
  
  if(sum <= 9) break;
  n = sum;
  sum = 0;
  }
  printf("%ld\n",sum);
 }
}